Most airlines never require you to change your password. I have not had to change mine for years and it has never been an issue. Also, LY's password is convoluted with a 4 digit PIN plus 4 letters - a very weird implementation of security.
Overall the approach to web security at banks and other organizations in Israel has been very badly thought through. IME changing one's password regularly increases the security risk rather than reducing it, unless there is a good reason to do so such as a breach.